Sony Xperia XZ1
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Sony Xperia XZ1

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My Sony Xperia XZ1 Android 8.0 uses a large amount of mobile data

Cause 1 of 2: Automatic use of mobile data is turned on

If automatic mobile data usage is turned on, your phone will use mobile data when the connection to the Wi-Fi network is poor.

Solution: Turn off automatic use of mobile data.

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